Analysis

  • max time kernel
    147s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07-04-2024 23:11

General

  • Target

    8bcf0943abd7860c3d5790969643cfb62da770db1c45bccdf69a71f6cfbc61c1.exe

  • Size

    424KB

  • MD5

    adde7a82f57387410210b34ebce305ca

  • SHA1

    416e571e09e4a713f5b8ea33a5b64da9990e1a17

  • SHA256

    8bcf0943abd7860c3d5790969643cfb62da770db1c45bccdf69a71f6cfbc61c1

  • SHA512

    9aac8f21198c1e838cf4a6b69ff17f3b714ab72fa452ff001e02e5546a3d9cf68bc4848a2a59e7e7effb88f522aab82767d0740b6359bbf7bf927ef4e31968b2

  • SSDEEP

    3072:nQC+GXgmYA/npA+fkBEcBoUTqp8YVE83jy11BGWjyLmar5FCO3ztKSwni9JCa2i:nQqgmYA/npAJBBo4q2YXAyL1L3BYq

Malware Config

Signatures

  • Detects executables containing base64 encoded User Agent 2 IoCs
  • UPX dump on OEP (original entry point) 5 IoCs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • UPX packed file 4 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Enumerates connected drives 3 TTPs 2 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

    Bootkits write to the MBR to gain persistence at a level below the operating system.

  • Drops file in Program Files directory 4 IoCs
  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\8bcf0943abd7860c3d5790969643cfb62da770db1c45bccdf69a71f6cfbc61c1.exe
    "C:\Users\Admin\AppData\Local\Temp\8bcf0943abd7860c3d5790969643cfb62da770db1c45bccdf69a71f6cfbc61c1.exe"
    1⤵
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1296
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /c ping 127.0.0.1 -n 2&C:\Users\Admin\AppData\Local\Temp\\tknkl.exe "C:\Users\Admin\AppData\Local\Temp\8bcf0943abd7860c3d5790969643cfb62da770db1c45bccdf69a71f6cfbc61c1.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4420
      • C:\Windows\SysWOW64\PING.EXE
        ping 127.0.0.1 -n 2
        3⤵
        • Runs ping.exe
        PID:4380
      • C:\Users\Admin\AppData\Local\Temp\tknkl.exe
        C:\Users\Admin\AppData\Local\Temp\\tknkl.exe "C:\Users\Admin\AppData\Local\Temp\8bcf0943abd7860c3d5790969643cfb62da770db1c45bccdf69a71f6cfbc61c1.exe"
        3⤵
        • Deletes itself
        • Executes dropped EXE
        • Drops file in Program Files directory
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:3200
        • \??\c:\Program Files\btbzw\aqd.exe
          "c:\Program Files\btbzw\aqd.exe" "c:\Program Files\btbzw\aqdzp.dll",Compliance C:\Users\Admin\AppData\Local\Temp\tknkl.exe
          4⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Adds Run key to start application
          • Enumerates connected drives
          • Writes to the Master Boot Record (MBR)
          • Checks processor information in registry
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:2224

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Program Files\btbzw\aqd.exe

    Filesize

    60KB

    MD5

    889b99c52a60dd49227c5e485a016679

    SHA1

    8fa889e456aa646a4d0a4349977430ce5fa5e2d7

    SHA256

    6cbe0e1f046b13b29bfa26f8b368281d2dda7eb9b718651d5856f22cc3e02910

    SHA512

    08933106eaf338dd119c45cbf1f83e723aff77cc0f8d3fc84e36253b1eb31557a54211d1d5d1cb58958188e32064d451f6c66a24b3963cccd3de07299ab90641

  • C:\Users\Admin\AppData\Local\Temp\tknkl.exe

    Filesize

    424KB

    MD5

    d2b0c50d5c59811e2e981d67c3a7ca6e

    SHA1

    21c82947de3f1a7114c5052e7f3e5f9f54b4bec6

    SHA256

    dd485b2001e0570f0019f3509cad809046f458cb4eaccb9fdbfea76721bd299b

    SHA512

    8a9f9977eb79bb33ce722ef1e098313defd1f33fbc594e494a4d4ceef13d10f99d2cbd331f64dc3edafd75e0c93627a46d1cc85664771849704c0bf8d1f8ad20

  • \??\c:\Program Files\btbzw\aqdzp.dll

    Filesize

    141KB

    MD5

    d45f9efa3c3875e9823909e709f92129

    SHA1

    bc023e74365b6dbf10f64b48bc8f98871e76d701

    SHA256

    e51cc7aaa0c3a52caa2508fddc217a156445b32a87899e89f0c7e96a4d62aedc

    SHA512

    8d1d33704cfcabdf4335ead94faf22b75db8f957b94c2c00d201a0f240af65f1261c9c1a5ced8e537ab7e9f4aa5cc466c5d2d9cf09f200b390f117b46f0f23e2

  • memory/1296-0-0x0000000000400000-0x0000000000469000-memory.dmp

    Filesize

    420KB

  • memory/1296-2-0x0000000000400000-0x0000000000469000-memory.dmp

    Filesize

    420KB

  • memory/2224-14-0x0000000010000000-0x000000001004E000-memory.dmp

    Filesize

    312KB

  • memory/2224-15-0x0000000010000000-0x000000001004E000-memory.dmp

    Filesize

    312KB

  • memory/2224-17-0x0000000010000000-0x000000001004E000-memory.dmp

    Filesize

    312KB

  • memory/3200-10-0x0000000000400000-0x0000000000469000-memory.dmp

    Filesize

    420KB